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prefer to generate constant pool loads over splats. This prevents us from

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using a splat for {1.0,1.0,1.0,1.0}

llvm-svn: 27055
This commit is contained in:
Chris Lattner 2006-03-24 07:29:17 +00:00
parent a69d722c90
commit 62b04677c0
1 changed files with 35 additions and 36 deletions
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71
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -3113,6 +3113,11 @@ SDOperand SelectionDAGLegalize::ExpandBUILD_VECTOR(SDNode *Node) {
SDOperand SplatValue = Node->getOperand(0);
std::map<SDOperand, std::vector<unsigned> > Values;
Values[SplatValue].push_back(0);
bool isConstant = true;
if (!isa<ConstantFPSDNode>(SplatValue) && !isa<ConstantSDNode>(SplatValue) &&
SplatValue.getOpcode() != ISD::UNDEF)
isConstant = false;
for (unsigned i = 1; i < NumElems; ++i) {
SDOperand V = Node->getOperand(i);
std::map<SDOperand, std::vector<unsigned> >::iterator I = Values.find(V);
@ -3124,6 +3129,12 @@ SDOperand SelectionDAGLegalize::ExpandBUILD_VECTOR(SDNode *Node) {
isOnlyLowElement = false;
if (SplatValue != V)
SplatValue = SDOperand(0,0);
// If this isn't a constant element or an undef, we can't use a constant
// pool load.
if (!isa<ConstantFPSDNode>(V) && !isa<ConstantSDNode>(V) &&
V.getOpcode() != ISD::UNDEF)
isConstant = false;
}
if (isOnlyLowElement) {
@ -3135,6 +3146,30 @@ SDOperand SelectionDAGLegalize::ExpandBUILD_VECTOR(SDNode *Node) {
Node->getOperand(0));
}
// If all elements are constants, create a load from the constant pool.
if (isConstant) {
MVT::ValueType VT = Node->getValueType(0);
const Type *OpNTy =
MVT::getTypeForValueType(Node->getOperand(0).getValueType());
std::vector<Constant*> CV;
for (unsigned i = 0, e = NumElems; i != e; ++i) {
if (ConstantFPSDNode *V =
dyn_cast<ConstantFPSDNode>(Node->getOperand(i))) {
CV.push_back(ConstantFP::get(OpNTy, V->getValue()));
} else if (ConstantSDNode *V =
dyn_cast<ConstantSDNode>(Node->getOperand(i))) {
CV.push_back(ConstantUInt::get(OpNTy, V->getValue()));
} else {
assert(Node->getOperand(i).getOpcode() == ISD::UNDEF);
CV.push_back(UndefValue::get(OpNTy));
}
}
Constant *CP = ConstantPacked::get(CV);
SDOperand CPIdx = DAG.getConstantPool(CP, TLI.getPointerTy());
return DAG.getLoad(VT, DAG.getEntryNode(), CPIdx,
DAG.getSrcValue(NULL));
}
if (SplatValue.Val) { // Splat of one value?
// Build the shuffle constant vector: <0, 0, 0, 0>
MVT::ValueType MaskVT =
@ -3156,42 +3191,6 @@ SDOperand SelectionDAGLegalize::ExpandBUILD_VECTOR(SDNode *Node) {
}
}
// If the elements are all constants, turn this into a load from the constant
// pool.
bool isConstant = true;
for (SDNode::op_iterator I = Node->op_begin(), E = Node->op_end();
I != E; ++I) {
if (!isa<ConstantFPSDNode>(I) && !isa<ConstantSDNode>(I) &&
I->getOpcode() != ISD::UNDEF) {
isConstant = false;
break;
}
}
// Create a ConstantPacked, and put it in the constant pool.
if (isConstant) {
MVT::ValueType VT = Node->getValueType(0);
const Type *OpNTy =
MVT::getTypeForValueType(Node->getOperand(0).getValueType());
std::vector<Constant*> CV;
for (unsigned i = 0, e = NumElems; i != e; ++i) {
if (ConstantFPSDNode *V =
dyn_cast<ConstantFPSDNode>(Node->getOperand(i))) {
CV.push_back(ConstantFP::get(OpNTy, V->getValue()));
} else if (ConstantSDNode *V =
dyn_cast<ConstantSDNode>(Node->getOperand(i))) {
CV.push_back(ConstantUInt::get(OpNTy, V->getValue()));
} else {
assert(Node->getOperand(i).getOpcode() == ISD::UNDEF);
CV.push_back(UndefValue::get(OpNTy));
}
}
Constant *CP = ConstantPacked::get(CV);
SDOperand CPIdx = DAG.getConstantPool(CP, TLI.getPointerTy());
return DAG.getLoad(VT, DAG.getEntryNode(), CPIdx,
DAG.getSrcValue(NULL));
}
// If there are only two unique elements, we may be able to turn this into a
// vector shuffle.
if (Values.size() == 2) {